[ Adding x86 and text_poke folks ]
On Thu, 5 Jun 2025 17:12:10 +0530 Naresh Kamboju <naresh.kamb...@linaro.org> wrote: > Regressions found on qemu-x86_64 with compat mode (64-bit kernel > running on 32-bit userspace) while running LTP tracing test suite > on Linux next-20250605 tag kernel. > > Regressions found on > - LTP tracing > > Regression Analysis: > - New regression? Yes > - Reproducible? Intermittent > > Test regression: qemu-x86_64-compat mode ltp tracing Oops int3 kernel panic > > Reported-by: Linux Kernel Functional Testing <l...@linaro.org> > > ## Test log > ftrace-stress-test: <12>[ 21.971153] /usr/local/bin/kirk[277]: > starting test ftrace-stress-test (ftrace_stress_test.sh 90) > <4>[ 58.997439] Oops: int3: 0000 [#1] SMP PTI Did anything change with text_poke? Ftrace just happens to stress text_poke more than anything else, as it updates tens of thousands of locations at a time. The ftrace code hasn't changed in a while, but I think there's been updates to text_poke. The modifying of code and adding and removing the int3 handler needs to be synchronized correctly or something like this bug can happen. -- Steve > <4>[ 58.998089] CPU: 0 UID: 0 PID: 323 Comm: sh Not tainted > 6.15.0-next-20250605 #1 PREEMPT(voluntary) > <4>[ 58.998152] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), > BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > <4>[ 58.998260] RIP: 0010:_raw_spin_lock+0x5/0x50 > <4>[ 58.998563] Code: 5d e9 ff 12 00 00 66 66 2e 0f 1f 84 00 00 00 > 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 > 0f 1e fa 0f <1f> 44 00 00 55 48 89 e5 53 48 89 fb bf 01 00 00 00 e8 15 > 12 e4 fe > <4>[ 58.998610] RSP: 0018:ffff9494007bbe98 EFLAGS: 00000246 > <4>[ 58.998715] RAX: ffff912a042edd00 RBX: 000000000000000b RCX: > 0000000000000000 > <4>[ 58.998727] RDX: 0000000000000000 RSI: 0000000000000006 RDI: > ffff912a00f2c8c0 > <4>[ 58.998737] RBP: ffff9494007bbeb8 R08: 0000000000000000 R09: > 0000000000000000 > <4>[ 58.998748] R10: 0000000000000000 R11: 0000000000000000 R12: > ffff912a00f2c8c0 > <4>[ 58.998759] R13: ffff912a00f2c840 R14: 0000000000000006 R15: > 0000000000000000 > <4>[ 58.998804] FS: 0000000000000000(0000) > GS:ffff912ad7cbf000(0063) knlGS:00000000f7f05580 > <4>[ 58.998821] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 > <4>[ 58.998832] CR2: 00000000f7d8f890 CR3: 000000010124e000 CR4: > 00000000000006f0 > <4>[ 58.998915] Call Trace: > <4>[ 58.999010] <TASK> > <4>[ 58.999077] ? file_close_fd+0x32/0x60 > <4>[ 58.999147] __ia32_sys_close+0x18/0x90 > <4>[ 58.999172] ia32_sys_call+0x1c3c/0x27e0 > <4>[ 58.999183] __do_fast_syscall_32+0x79/0x1e0 > <4>[ 58.999194] do_fast_syscall_32+0x37/0x80 > <4>[ 58.999203] do_SYSENTER_32+0x23/0x30 > <4>[ 58.999211] entry_SYSENTER_compat_after_hwframe+0x84/0x8e > <4>[ 58.999254] RIP: 0023:0xf7f0c579 > <4>[ 58.999459] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 > 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 > 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 2e 8d b4 26 00 00 00 00 8d b4 26 > 00 00 00 > <4>[ 58.999466] RSP: 002b:00000000fff98500 EFLAGS: 00000206 > ORIG_RAX: 0000000000000006 > <4>[ 58.999479] RAX: ffffffffffffffda RBX: 000000000000000b RCX: > 0000000000000000 > <4>[ 58.999484] RDX: 0000000000000000 RSI: 0000000000000000 RDI: > 0000000000000000 > <4>[ 58.999488] RBP: 0000000000000000 R08: 0000000000000000 R09: > 0000000000000000 > <4>[ 58.999492] R10: 0000000000000000 R11: 0000000000000206 R12: > 0000000000000000 > <4>[ 58.999497] R13: 0000000000000000 R14: 0000000000000000 R15: > 0000000000000000 > <4>[ 58.999534] </TASK> > <4>[ 58.999579] Modules linked in: > <4>[ 58.999895] ---[ end trace 0000000000000000 ]--- > <4>[ 58.999892] Oops: int3: 0000 [#2] SMP PTI > <4>[ 58.999997] RIP: 0010:_raw_spin_lock+0x5/0x50 > <4>[ 59.000008] Code: 5d e9 ff 12 00 00 66 66 2e 0f 1f 84 00 00 00 > 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 > 0f 1e fa 0f <1f> 44 00 00 55 48 89 e5 53 48 89 fb bf 01 00 00 00 e8 15 > 12 e4 fe > <4>[ 59.000010] CPU: 1 UID: 0 PID: 339 Comm: sh Tainted: G D > 6.15.0-next-20250605 #1 PREEMPT(voluntary) > <4>[ 59.000014] RSP: 0018:ffff9494007bbe98 EFLAGS: 00000246 > <4>[ 59.000021] RAX: ffff912a042edd00 RBX: 000000000000000b RCX: > 0000000000000000 > <4>[ 59.000026] RDX: 0000000000000000 RSI: 0000000000000006 RDI: > ffff912a00f2c8c0 > <4>[ 59.000030] RBP: ffff9494007bbeb8 R08: 0000000000000000 R09: > 0000000000000000 > <4>[ 59.000040] R10: 0000000000000000 R11: 0000000000000000 R12: > ffff912a00f2c8c0 > <4>[ 59.000044] R13: ffff912a00f2c840 R14: 0000000000000006 R15: > 0000000000000000 > <4>[ 59.000049] FS: 0000000000000000(0000) > GS:ffff912ad7cbf000(0063) knlGS:00000000f7f05580 > <4>[ 59.000054] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 > <4>[ 59.000059] CR2: 00000000f7d8f890 CR3: 000000010124e000 CR4: > 00000000000006f0 > <4>[ 59.000070] Tainted: [D]=DIE > <4>[ 59.000080] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), > BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > <4>[ 59.000085] RIP: 0010:_raw_spin_lock+0x5/0x50 > <4>[ 59.000101] Code: 5d e9 ff 12 00 00 66 66 2e 0f 1f 84 00 00 00 > 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 > 0f 1e fa 0f <1f> 44 00 00 55 48 89 e5 53 48 89 fb bf 01 00 00 00 e8 15 > 12 e4 fe > <4>[ 59.000108] RSP: 0018:ffff9494000e0e88 EFLAGS: 00000097 > <4>[ 59.000117] RAX: 0000000000010002 RBX: ffff912a7bd29500 RCX: > ffff912a7bd2a400 > <0>[ 59.000179] Kernel panic - not syncing: Fatal exception in interrupt > <0>[ 60.592321] Shutting down cpus with NMI > <0>[ 60.593242] Kernel Offset: 0x20800000 from 0xffffffff81000000 > (relocation range: 0xffffffff80000000-0xffffffffbfffffff) > <0>[ 60.618536] ---[ end Kernel panic - not syncing: Fatal exception > in interrupt ]--- > > ## Source > * Kernel version: 6.15.0-next-20250605 > * Git tree: > https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git > * Git sha: 4f27f06ec12190c7c62c722e99ab6243dea81a94 > > ## Build > * Test log: https://qa-reports.linaro.org/api/testruns/28675335/log_file/ > * Build link: > https://storage.tuxsuite.com/public/linaro/lkft/builds/2y4whKazVqJKOUFD08taHC8XHRq/ > * Kernel config: > https://storage.tuxsuite.com/public/linaro/lkft/builds/2y4whKazVqJKOUFD08taHC8XHRq/config > > > -- > Linaro LKFT > https://lkft.linaro.org
